I thing about £1200 would be fair shop value for them - but they have got the make an offer button which always makes me think they have listed them at their ideal price.
anyway - back to the electronics. I have contacted Alan Exley but he hasnt got any pickups available, does have original routing patterns for them though if i manage to get a set and need to plug and re-route cavities.
he also explained the thinking with the tone controls:
"the idea was, one way was treble cut & the other way was bass cut. so you could get a good tonal sweep, but in my way of thinking, I think this is a bad idea, cause it made the pick ups sound slightly dull & with less power, but the tone controls seem to be wired up incorrectly anyway. "
i have just had a little play with the wiring and it does seem to be all working. although as alan points out, the tone controls may be wired incorrectly. To me they are oddly placed in the circuit with the signal having to go through them before reaching the volume